Remove Tip demo link (timeout) (#4015)

- ref. #3558
- `https://demo.runtipi.io : HTTPSConnectionPool(host='demo.runtipi.io', port=443): Max retries exceeded with url: / (Caused by ConnectTimeoutError(<urllib3.connection.HTTPSConnection object at 0x7efd0c5b3cd0>, 'Connection to demo.runtipi.io timed out. (connect timeout=10)'))`

README.md

@@ -1763,7 +1763,7 @@ Software for easy installation, management and configuration of self-hosted serv
 - [OpenMediaVault](https://www.openmediavault.org/) - OpenMediaVault is the next generation network attached storage (NAS) solution based on Debian Linux. It contains services like SSH, (S)FTP, SMB/CIFS, DAAP media server, RSync, BitTorrent client and many more. ([Source Code](https://github.com/openmediavault/openmediavault)) `GPL-3.0` `PHP`
 - [Sandstorm](https://sandstorm.io/) - Personal server for running self-hosted apps easily and securely. ([Demo](https://demo.sandstorm.io/), [Source Code](https://github.com/sandstorm-io/sandstorm)) `Apache-2.0` `C++/Other`
 - [Syncloud](https://syncloud.org/) - Your own online file storage, social network or email server. ([Source Code](https://github.com/syncloud/platform)) `GPL-3.0` `Python/Other`
-- [Tipi](https://runtipi.io/) - Homeserver manager. One command setup, one click installs for your favorites self-hosted apps. ([Demo](https://demo.runtipi.io), [Source Code](https://github.com/meienberger/runtipi)) `GPL-3.0` `Shell`
+- [Tipi](https://runtipi.io/) - Homeserver manager. One command setup, one click installs for your favorites self-hosted apps. ([Source Code](https://github.com/meienberger/runtipi)) `GPL-3.0` `Shell`
 - [UBOS](https://ubos.net/) - Linux distro that runs on indie boxes (personal servers and IoT devices). Single-command installation and management of apps - Jenkins, Mediawiki, Owncloud, WordPress, etc., and other features. `GPL-3.0` `Perl/Other`
 - [WikiSuite](https://wikisuite.org) - The most comprehensive and integrated Free / Libre / Open Source enterprise software suite. ([Source Code](https://wikisuite.org/Source-Code)) `GPL-3.0/LGPL-2.1/Apache-2.0/MPL-2.0/MPL-1.1/MIT/AGPL-3.0` `ClearOS`
 - [xsrv](https://xsrv.readthedocs.io/) - Install and manage self-hosted services/applications, on your own server(s). ([Source Code](https://github.com/nodiscc/xsrv)) `GPL-3.0` `Shell/Ansible`